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Income Taxes - Reconciliation of Effective Income Tax Rate (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation |  |
Tax at statutory federal rate (percent) | (21.00%) | (34.00%)
State tax, net of federal benefit (percent) | (5.30%) | (4.30%)
Measurement of deferred taxes as a result of tax reform (percent) | (0.00%) | 68.70%
Tax credits (percent) | (0.70%) | (0.30%)
Change in deferred tax valuation allowance (percent) | 26.20% | (32.60%)
Other (percent) | 0.80% | 2.50%
Total income tax expense (percent) | (0.00%) | (0.00%)

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